'transfusion' originates from Latin, specifically the word 'transfusio,' where 'trans-' meant 'across' and 'fundere' meant 'to pour.'

'transfusio' transformed into the French word 'transfusion,' and eventually became the modern English word 'transfusion' through Middle English.

Initially, it meant 'to pour across,' but over time it evolved into its current meaning of 'transferring blood or fluids.'